As salaamu alaikum ahki
I'm not into boxing(western style anyway) but that as well as all other forms of fighting have to have the purpose of getting ready for jihaad fisabillilah.
My take on boxing is that it is very good for fighting outside of the ring. A lot of brothers in Philly, pa box so if your ever up there stop by the germantown Masjid and get some pointers, insha Allah.